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BET theory

About: BET theory is a research topic. Over the lifetime, 9046 publications have been published within this topic receiving 286142 citations.


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Journal ArticleDOI
TL;DR: In this paper, the nitrogen-doped polycrystalline powders were synthesized by calcination of the hydrolysis product of tetra-butyl titanate with ammonia.
Abstract: In this study, the nitrogen-doped TiO2 polycrystalline powders were synthesized by calcination of the hydrolysis product of tetra-butyl titanate with ammonia. According to the XRD, SEM, XPS, UV–vis absorption and BET analysis, we found that the N-doped TiO2 has mesoporous structures and the nitrogen doping causes the absorption edge of TiO2 to shift to a lower energy region. It is considered that nitrogen atoms in doped TiO2 polycrystalline powder are responsible for the significant enhancement in the doped TiO2 photoactivity under visible light irradiation. We explored the photocatalytic activity of N-doped TiO2 under various irradiation conditions. We found the photocatalytic activity of the N-doped TiO2 with anatase phases was higher than that of the commercial TiO2 photocatalyst Degussa P25 for phenol decomposition under visible light irradiation, while Degussa P25 showed higher photocatalytic activity under sunlight irradiation. The FT-IR spectra showed that products of phenol decomposition adsorbed on the catalyst surface after photodegradation of phenol.

262 citations

Journal ArticleDOI
TL;DR: In this paper, an Activated Carbon (AC) with high purity and surface area was synthesized from rice husk (RH) using alkali leaching at room temperature, and the maximum surface area obtained from the BET analysis was 2696m2g−1 for the KOH activated carbon at 850°C with an impregnation ratio of 1:5 under nitrogen flow.

262 citations

Journal ArticleDOI
TL;DR: In this article, a microwave assisted chemical activation of activated carbon has been attempted from coconut husk (CHAC) via microwave-assisted chemical activation, and the operational parameters including the effects of activation agents, chemical impregnation ratio (0.25-2.00), microwave power (90-800 W), and irradiation time (4-8 min) on the carbon yield and adsorption capability were investigated.

260 citations

Journal ArticleDOI
TL;DR: The results obtained showed that chitosan powder, at a dosage of 0.5g/l, 15min of contact time and a pH value of 5.0, presented the most suitable conditions for the adsorption of residue oil from POME.

259 citations

Journal ArticleDOI
15 Jan 2004
TL;DR: It was found that the data fit well to Langmuir, Halsey, Henderson, and Harkins-Jura models but experimental data deviate significantly from BET and Freundlich models at especially high concentrations.
Abstract: In this study, adsorption of methylene blue onto clay was investigated. The effect of adsorption time and temperature on the adsorption process was studied. To reveal the adsorptive characteristics of the clay studied, porosity and BET surface area measurements were made. It was observed that the adsorption capacity decreases with increasing temperature, and adsorption equilibrium was attained within 1 h. It was found that the data fit well to Langmuir, Halsey, Henderson, and Harkins-Jura models but experimental data deviate significantly from BET and Freundlich models at especially high concentrations. Furthermore, isosteric adsorption enthalpy and entropy are calculated as -7.99 kJ mol(-1) and 25.41 JK(-1)mol(-1), respectively.

259 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023166
2022356
2021525
2020551
2019533
2018531